CaptainsGround vs Mariners Learning System
Mariners Learning System is a long-standing online prep provider with USCG-approved exam authority. CaptainsGround is free, citation-backed, and built around adaptive drilling — different value props for different candidates.
TL;DR
MLS: paid course (~$549), USCG exam authority included, video lectures. CaptainsGround: free, citation-linked drills + lessons + FSRS flashcards + mock exams, no exam authority — you take the test at a REC.
| Feature | CaptainsGround | Mariners Learning System |
|---|---|---|
| Price | Free during early access | ~$549 OUPV course |
| USCG exam authority | No (you test at a REC) | Yes (test at home) |
| Citation links | Every Q linked to source | Limited |
| Drill question count | 500+ approved | Module-style banks |
| FSRS spaced repetition | Yes (FSRS-4) | No |
| Mock exam | 70Q × 90min, NMC format | Yes |
| Study format | Read + drill + flashcards | Video + reading + Q-bank |
Bottom line
If you want to test at home and don't mind paying, MLS is the convenient package. If you'll test at a REC anyway and want a free, citation-backed prep tool, CaptainsGround is the better fit.